Ehninger, D. (1982). Principles and types of speech communication (9th ed.). National Book Store.
Chicago-referens (17:e uppl.)Ehninger, Douglas. Principles and Types of Speech Communication. 9th ed. Manila: National Book Store, 1982.
MLA-referens (9:e uppl.)Ehninger, Douglas. Principles and Types of Speech Communication. 9th ed. National Book Store, 1982.
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